Bore gauge



H. M. RGGKWELL.

BORE GAUGE.

APPLIQATloN FILED DE01, 1919.

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HUGH M. ROCKXTELL, OF BRISTOL, CQNNEGTICUT, SSIGNOR, BY LYLESNE ASSIGN- MENTS, TQ STANDARD STEEL AND .lSlflAB/INGS INCQE?O,RATED, QE* flTJ'Lll/QING- TON, DELAl/"Al-lil, A OG RPORATION Gld DELAVTARIE.

nona eenen.

Application filed. December l, 1919.

and State of Connecticut, have invented certain-new and useful Improvements in Bore Gauges, of which the following` is a speciiication This invention relates to measuring instruments, and more especially to a gauge for determining the diameter of a circular bore or the like, such, for example, as the bore of the inner race member of an antil 'friction bearing.

vThe sizing of bores, such as the abovenoted example, is generally accomplished by causing the material in which is the bore to be rotated at a high rate of speed and apply a tool to the interior surface of the bore. To determine whether sui-,h a bore has been brought to the proper size, it hasbeen the custom to cease operation upon the work, stop the rotation thereof, and insert into the bore a gauge of some description.

It is the object of this invention to provide a gauge by means of which the bore of a piece of worlr may be measured while the work is being rotated.

A further object of the invention is the provision of an instrument for accurately the bore of a piece of work.

An additional object of the invention is the provision., in a bore gauge, of means to aline the axis of the gauge with the axis of the worlr. y

V'll laccomplish these objects and to improve generally upon devices of this class, I

n provide a frame, carrying at one end a head or plugY having` conical surface. Coaxial and capable of axial displacement relative to said head, I provide a second head similar to saidfirst head except that it is oppositely disposed. Surrounding the coacting heads and arranged for limited movement radially or axially of the two heads is a rotatable ineniberprovided with two annular rows of apertures in which are mounted Contact elements, preferably steel balls, each of ywhich is adapted to engagethe surface of oneof said heads. and to project beyond the outer surface of said annular member.

' A'lo cooperate with said movable head, I 4provide vsuitable indicating` meanathrough Spcciieation of Letters Patent.

latenteddiily 25, Serial No. 341571.

the medium of which the bore diameter may be determined.

In use, this instrument is inserted in a `bore of a rotating` or stationary piece `of worlr and the heads moved apart, the two rows of contact elements engagingthe surface of the bore, and the contact-.holding member adjusting itself. The engagement of bot-li rows of Contact elements with `the bore surface brings the anis of the two Iheads into aliiiement Vwith the anis of the bore, thus insuring accurate gagging since the planes of the lines of Contact are perpendicular to the axis, The relative rotationof the work and the gauger does .not affect rthe operation of the latter since `the vcontactv holding4 member is free to rotate relative to thc coactingheads.

In the accompanying drawings,

Fig. l is a side elevation, partly in section and partly broken away; of the gauge in use.

A frame l carries at its reduced end. a plug` or head 2 which is preferably screw- 'threaded into the frame.Y The peripheral surface of the head is tapered anc ispreferably conical. Coaxial with the head2 and carried by the sha-nk 4;, snuglybut slidably mounted in a suitable bore 5 in the head 2, is the head 6, the peripheral surface 7 of which is similar to the surface 3 but oppositely disposed. Surrounding the heads 2 and 6, and arranged for limited. movement radially or axially thereof is a rotatable member or cage-8, in which are provided two annular rows of apertures 9 in which are located the balls l0. Knobs or projections l1 at the outer end of the apertures prevent the escape of the balls therefrom. An annular rib l2 in the member@ entends between the heads 2 and 6 and limits the axial movement of said member relative to the Aheads. A

.spring 18 interposed'between the heads 2 and 6 serves to forceA the heads apart.

The inner end of the shanlr acts on the lever lll, one .arm .of which is Vextended to cooperate vwith a dial 15 'having indicia thereon by means of which` variations in the .position -of the heads may-be determined.

The ratio ofthe :distances of. tlie..point of engagement of the shanlr 4 with the lever 'la and theendof the indicatorarmifrom the-pivot Apointr of the `Ilever results in a substantial variation ot' position ot the end of the indicator arm from a slight movei t of 'the shank fl, thus clearly indicating slight differences in position of the heads 2 f linger lever 16 is connected with l e to operate the same against the t the spring` 13. A spring 17 serves i the elboiv ot the lever 14.L in contogether by tion the finger lever 16, thus allowingthe balls to move inwardly, rEhe end ot the device cari ne' the heads, cage and balls, is then inserted into the bore and the lever 16 rel ased. allowing; the springr 13 to separate the heads Q and 6. rlhe tapered surfaces 3 and T engage the balls 10 and 'torce them .into Contact With the surface ot the bore. tiince the cage 8 is loosely mounted, it automatically assumes a central position vrith respect t0 the heads and G, The Contact ot both roivs ol" balls with the surface serves to automatically aline the gauge with the ivorr being` gagged and thus assure vaccurate measurment of the bore.

This gauge may be inserted in the bore to be gagged While the Werl: is being,- rotated at a high rate oit speed or vhile the Worlr is stationary. ln either event the balls ivill be moved into contact with the surta-ce and the indicator will disclose the size ol the bore.

lt is understood.. ol' course that this gauge is intended primarily tor comparative ng, 1t is therefore necessary that such a gauge be first tested in connection vf'hh member having" therein a standard bore and a reading of the indicator innen.. against which subsequent readings ot other members may be checked.

What l claim is:

' 1. ln a device of the character described, members having` oppositely-disposed tapered peripheral sur'l'aces, said members being movable relative to each other, a holder loosely surrounding said members and having a rib extending bet-Ween said members, contact elements carried by said holder and adapted to contact with said members and the material to be ,ej ged, and indicator means operatively associated with said members.

2. In a device of the character described, a frame, a member having an aperture carried by said trame, a second member, the peripheral surfaces of each member being tapered in opposite. directions, a shank on said second member extending` through said ber relative to said first member, and indica or means operatively associated With said member.

S, ln device or the character described, a member mounted in one end of `econd member mounted for Y, C. surfaces ot' each member being apered in opposite directions, a holder surrounding;` said members, contact elements carrier, by said holder and adapted to contact with said surta/:es and the material to be gagged, a spring interposed betiveen said members and adapted to force said movable member in one direction, a lever to move said member .in the opposite direction, and indicator means operativelT associated With said member.

d. ln a device oit the character described, a trame a member having an aperture carried by said trame, a second. member, the peripheral surfaces ol' each member being tapered in opposite directions, a shank on said second member extending through said aperture, a holder loosely surrounding said members, means to limit the axial displacement of said holder, cont-act elements carried by said holder and adapted to contact with said surfaces and the material to be gagged, a spring, interposed between said members and adapted to .torce said movable member in one direction, a lever engaging the end of said shank and adapted, to move said member in the opposite direction, and means to indicate relative change in position thereof..

ln a device ot the character described, ame, a member having aperture carric-d by said trame, a second member, the periph-eral surfaces ot euch member being tapered in opposite directions.y a shank on said second member extending through said aperture. a holder loosely surrounding; said. members, a rib on said holder extending;` between said members. balls carried by said holder and adapted to contact with said surfaces and the material to be gagged, a spring' interposed bet-neen said members and adapt ed to torce said movable member in one diction, a lever vto move said member in the pposite direction, a lever engaged by the nu of said shank, ano means to indicate relative chantre in position thereof.

t5. In a de the character described,

or members having tapered peripheral surfaces,

said members being movable relative to each other, a holder surrounding said members, and a plurality oil' sets oi" contact elements carried by said holder, each element of each set being adapted to engage one ot said surfaces and the material to be gaged.

7. ln a device of the character described, members having oppositely-disposed conical peripheries, said members being movable relative to each other, an annular member surrounding said members, and a plurality of sets cf contact elements carried by said annular member, each element of each set being adapted` to engage one of said surfaces and the material to be gaged.

8. ln a device of the character described, members having tapered peripheral surfaces, said members being movable relative to each other, a holder loosely surrounding said members, means to limit the axial movement of said holder, and a plurality of sets of contact elements carried by said holder, each element of each set being adapted to engage one of said surfaces and the material to be gaged.

9. In a device of the character described, members having oppositely-disposed conical peripheries, said members being movable relative to each other, an annular member loosely surrounding said members, means to limit the axial movement of said annular member, and a plurality of sets of contact elements carried by said annular member, each element of each set being adapted to engage one of said surfaces and the material to be gaged.

l0. In a device of the character described,

a frame, a member mounted in one end ofsaid frame, a second member mounted for movement relative to said iirst member, the peripheral surfaces of each member being tapered in opposite directions, a holder surrounding said members, tWo sets of contact elements carried by said holder, each element of each set being adapted to engage one of said surfaces and the material to be gaged.

ll. In a device of the character described, members havin@` oppositely-disposed tapered peripheral surfaces, said members being movable relative to each other, a holder loosely surrounding said members and having a rib extending between said members, sets of contact elements carried by said holder on opposite sides of said rib, each element of each set being adapted to engage one of said surfaces and the material to be gaged.

l2. ln a device of the character described, a frame, a member having an aperture carried by said frame, a second member, the peripheral surfaces of each member being tapered in opposite directions, a shank on said second member extending through said aperture, a holder loosely surrounding said members, means to limit the axial displacement of said holder, sets of Contact elements carried by said holder on opposite sides of said rib, each element of each set being adapted to engage one of said surfaces and the material to be gaged.

13. ln a device of the character described, a frame, a member mounted in one end ofA said frame, a second member mounted for movement relative to said first member, the peripheralasurfaces of each member being tapered in opposite directions, a holder surrounding said members, sets of contact elements carried by said holder on opposite sides of said rib, each element of each of said sets being adapted to engage one of said surfaces and the material to be gaged, a s ning interposed between said members and adapted to force said movable member in one direction, and a lever to move said mem` ber in the opposite direction.

lil. In a device of the character described, a frame, a member having an aperture carried by said frame, a second member, the peripheral surfaces of each member being ta` pered in opposite directions, a shank on said second member extending through said aperture, a holder loosely surrounding said mem bers, means to limit the axial displacement of said holder, sets of contact elements carried by said holder on opposite sides of said rib, each element of each of said sets being adapted to engage one of said surfaces and the material to be gaged, a spring interposed between said members and adapted to forcel said movable member in one direction, and a lever to move said member in the opposite direction, said lever being in contact with the end of said shank.

15. ln a device of the character described, a frame, a member having an aperture carried by said frame., a second member, the peripheral surfaces of each member being tapered in opposite directions, a shank on said second member extending through said aperture, a holder loosely surrounding said members, a rib on said holder extending between said members, sets of balls carried by said holder, each ball of each set being adapted to engage one of said surfaces and the material to be gag-ed, a spring interposed betvveen said members and adapted to force said movable member in one direction, a lever to move said member in the opposite direction, a lever engaged by the end of said shank, and means to indicate relative change in position thereof.

HUGH M. ROCKVVELL. 

